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Definition of PCB:
Polychrorinated biphenyls (PCBs) is a large group of toxic synthetic lipid-soluble chlorinated hydrocarbons, which are used in various industrial processes and which have become persistent and ubiquitous environmental contaminants which can be concentrated in food chains.[1]
This is the common definition for PCB, other definitions can be discussed in the article


  1. Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain.